The lowest member of the series studied is 2, because having an aliphatic ring smaller than the 5-membered cyclopentenyl would be synthetically challenging due to the significant ring strain of a cyclobutene or cyclopropene.
Dust particles with high sublimation temperature form a significant dust ring, which could be found in the vicinity of the sun through in-situ spacecraft measurements.
A significant sublimation ring consisting of icy particles is not expected in a debris disk due to high eccentricities if a planetesimal belt as a dust source is located within a few hundreds AU, similar to the solar system.
However, at neutral and slightly basic conditions (pH 7.2 and pH 8.2), significant ring opening of lactone 1 a took place, which explains the rather poor product yield.
Metabolic analysis demonstrated that hydroxyatrazine was the major identified metabolite that accumulated in solution before significant ring mineralization could occur.
The transient diffusion-limited current at the ring electrode is calculated over significant time intervals and reaction rates for the full range of significant ring sizes using Danckwerts' expression [J. Galceran, S.L. Taylor, P.N. Bartlett, J. Electroanal. Chem. 466 (1999) 15].
Significant ring cleavage was not found.
Finally, cluster type 4 is merely composed of 1,2-disubstituted six-membered rings with a significant contamination of rings which can be classified as ring type 1 (Table 4).
Hot ring rolling is a significant branch of ring rolling characterized by high nonlinearity, 3D deformation, continuously progressive forming, unsteady-state, asymmetry, etc. with coupled thermo-mechanical behaviors which have significant effects on the deformation behavior, microstructure and mechanical properties of the ring.
Clusters 2 and 4 are less well clearly defined, with cluster type 2 being a mixture of rings of type 0, 1, 2, together with a significant fraction of rings which cannot be not classified into these seven ring clusters.
